Pulsed-field magnetization of a bulk superconductor with small holes

Yokoyama, K.; Oka, Tetsuo; Kondo, N.; Hosaka, Sumio

doi:10.1016/j.physc.2012.03.074

Cited by 6 publications

(1 citation statement)

References 11 publications

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“…The material fabrication technique of REBCO bulk as well as the mechanical reinforcement technique are improved remarkably, and, accordingly, it become easy to achieve a high trapped magnetic field above 10 T [1][2][3][4][5]. Therefore, it leads to development of various industrial applications such as a magnetic separation, magnetic drug delivery, a movable NMR, electric propulsion system for aircraft and marine vessel and so on [6][7][8][9][10][11][12]. One of those applications is a quasi-permanent magnet, in which a bulk is magnetized and afterwards cooled continuously [13].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of trapped field of REBCO bulk in a desktop-type magnet system

Yokoyama

Oka

2019

Eng. Res. Express

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We developed a desktop-type bulk magnet system using a Stirling refrigerator and used it to study how to improve the trapped field by pulsed field magnetization (PFM). Although PFM has the advantage that the bulk is activated in a few seconds using an ordinary inexpensive equipment, the amplitude of a trapped field is low as compared with the maximum performance of the material. This paper aims to improve the trapped field by changing the size of soft-iron yoke, which are generally used to extend the pulse width. When a f60-mm GdBCO bulk was magnetized using f64-mm and f80-mm yokes, the maximum flux density and total magnetic flux of large yoke were 13% and 23% higher than those of small one, respectively. Moreover, improvement of trapped field by multi PFM was investigated. When a magnetic field of 5.8 T was applied twice, the maximum trapped field of 1.46 T and the total magnetic flux of 1.86 mWb were achieved.

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Section: Introductionmentioning

confidence: 99%

Enhancement of trapped field of REBCO bulk in a desktop-type magnet system

Yokoyama

Oka

2019

Eng. Res. Express

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Comparison of Trapped Field Characteristic of Bulk Magnet System Using Various Type Refrigerators

Yokoyama

Katsuki

Miura

et al. 2018

J. Phys.: Conf. Ser.

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Magnetizing characteristic evaluation of REBCO bulk in PFM using different yokes

Yokoyama

Oka

2020

J. Phys.: Conf. Ser.

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A REBCO bulk magnet is able to generate a several-tesla-class magnetic field by a compact system with low power consumption. Pulsed field magnetization (PFM), which is one of major magnetization method, has the advantage that the bulk is activated using a conventional equipment in a few seconds, and, therefore, it is suitable for practical use. However, a trapped field is lower than the maximum performance of material. To increase the field, improvement of magnetization method and modification of exciting equipment are considered. We aim to improve the trapped field by changing the exciting system simply and inexpensively. In the bulk magnet system, soft-iron yokes are generally used to extend the pulse width. This paper evaluated magnetizing characteristic quantitatively. A single pulsed field was applied to a new GdBCO bulk using ϕ64-mm and ϕ80-mm soft-iron yokes. The pulse width of ϕ80-mm yoke was about 35% longer than that of ϕ64-mm yoke. When comparing the trapped flux density and total magnetic flux, these values of ϕ80-mm yoke were higher than those of ϕ64-mm yoke. Also, the temperature rise of ϕ80-mm yoke was decreased by approximately 5% as compared with ϕ64-mm yoke, implying that the same effect as the long-pulse method was achieved.

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Pulsed-field magnetization of a bulk superconductor with small holes

Cited by 6 publications

References 11 publications

Enhancement of trapped field of REBCO bulk in a desktop-type magnet system

Enhancement of trapped field of REBCO bulk in a desktop-type magnet system

Comparison of Trapped Field Characteristic of Bulk Magnet System Using Various Type Refrigerators

Magnetizing characteristic evaluation of REBCO bulk in PFM using different yokes

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